Actuating mechanism for registers



Oct. 30, 1945. H. T. AVERY ACTUATING MECHANISM FOR REGISTERS Filed Aug.2, 1940 6 Sheets-Sheet 1 INVENTOR.

flaw/0 Z'rlre/y 1 BY ffi g ATTORNEYSK Oct.30, 1945. H. T. AVERYACTUATING MECHANISM FOR REGISTERS 6 Sheets-Sheet ,2

Filed Aug. 2, 1940 nun @OQOOOOOQO QOQOOOOQQD QQOQOOOQQQ DO @000 OOOQQFIE- l-A v IVVEA TOR Ham/0 T/h ey.

BY a a ATTORNEY.

Oct. 30, 1945. H. T. AVERY ACTUATING MECHANISM FOR REGISTERS Filed Aug.2, 1940 6 Sheets-Sheet 3 IN VEN TOR. flora/a [Are/y fi 3 1945.v H. T.AVERY 2,387,870

AGTUATING MECHANISM FOR REGISTERS Filed Aug. 2, 1940 6 Sheets-Sheet 4 IN V EN TOR. f/oro/o f/lrer ATTORNEYS.

Oct. 30, 1945. H. T IRVERY I ACTUATING MECHANISM FOR REGISTERSSheets-Sheet 5 Filed Aug. 2, 1940 FIEQLE- FIE -13.. FIE l% INVENTORHAROLD 7. AVERY B Y ATTORNEYS Oct. 30, 1945. H. T. AVERY 2,387,870

ACTUATING MECHANISM FOR REGISTERS Filed Aug. 2, 1940 6 Sheets-Sheet 6 Ia 1TT0RNEm Patented Oct. 30, 1945 AGTUATING MECHANISM FOR REGISTERSHarold T. Avery, Oakland, Calif., assignor to Marchant CalculatingMachine Company, a corporation of California Application August 2, 1940,Serial No. 349,940

3 Claims.

The present invention relates to actuating means for registers such asmay be used in adding and calculating machines.

Most present day machines of this type employ a shiftable accumulatorregister containing indicating dials and a separate actuator ofconsiderable size, Weight, and cost, because in machines of this typethere is necessarily provided in connection with each dial of theaccumulator register, transmission mechanisms to transmit movement fromthe actuator to the dial, and pawling devices for preventingdisplacement of the dial when it is disconnected from the actuator.

It is an object of the present invention to provide a register in whicheach dial has a clutch unit directly and permanently associatedtherewith for selectively and positively coupling the dial to thedriving mechanism for a predetermined interval of time to enter adesired value into that dial.

Thus, the present invention contemplates providing an independentactuating unit in the form of a clutch mechanism for each dial, andalthough the number of actuating units is thereby increased, the totalcost and weight of the combined actuating and registering devices issubstantially reduced, since the actuating, transmission, andregistering mechanisms are combined into one unit in each order.

It is another object of the present invention to provide positive andreliable control mechanism for determining the interval of time duringwhich each dial clutch is engaged to rotate its associated dial inaccordance with the setting of a selectively settable mechanism.

It is yet another object of the present invention to furnishpower-driven mechanism which is positively operable to engage a dialclutch of the type indicated at a fixed time and to selectivelydisengage said clutch after a predetermined extent of rotation of itsassociated dial.

Other objects of the present invention will become apparent from thefollowing description of a preferred exemplary embodiment of the presentinvention illustrated in the accompanying drawings in which:

Fig. 1A is a general view of the machine;

Fig. 1 is a right side skeleton view, showing the i general arrangementof elements;

Fig. 2 is a right side view of the mechanism for locking the selectionmechanism in the machine of Fig. 1;

Fig. 3 is a right side detail view of the mechanism for centralizing themain clutch;

Fig. 4 is a right side fragmentary view showing part of a variable speedtransmission unit used in the machine;

Fig. 5 is a top view, partly in section, of the main clutch and reverseunit;

Fig. 6 is a right side view of the plus and minus keys and the mechanismactuated thereby to control the main clutch and reverse unit;

Fig. 7 is a right side view showing the general arrangement of thetens-transfer mechanism;

Fig. 8 is a detailed section of part of the transfer mechanismshown inFig. '7;

Fig. 9 is an enlarged view of part of the transfer mechanism, taken onthe line lX-IX of Fig. '7, showing the means for conditioning themachine for a chain transfer;

Fig. 10 is a right side view, showing details of the mechanism foractuating the transfer feeler mechanism;

Fig. 11 is an enlarged side view of the accumulator clutch;

Fig. 11A is a cross section taken substantially along the line XIA-XIAof Fig. 11;

Figs. 12 to 14, inclusive, are right side sectional views of theaccumulator clutch, the planes of the sections being taken as indicatedin Fig. 11A.

Fig. 15 is a right side view of the mechanism for effecting entry of thefugitive digit;

Fig. 16 is a right side view of the accumulator clutch controls and themeans for disengaging the clutch durin clearance;

Fig. 17 is a right side view of the clear cam and the means foreiiecting engagement of the clutch during clearance;

Fig. 18 is a sectional view, looking down, of the clearance actuatingmechanism;

DETAILED DESCRIPTION As shown in Fig. 1A, the first embodiment oftheinvention is an adding and subtracting machine having a keyboard Icontaining a plurality of keys I00 arranged in eight orders, each ordercontaining ten keys numbered consecutively from zero to nine. Themachine includes a plurality of accumulator windows 2, oneassociatedwith each order of keys, and each displaying a number on anaccumulator dial associated with that order of keys. The machine alsohas a plus actuating key or bar 200 and a minu actuating key or bar 220to condition the machine for addition or subtraction,- as desired. Thesekeys also function to set the mechanism into operation. Thus if a numberis to be added into the accumulator, it is first set up on the keys I00and then the plus bar 200 is struck, whereupon the accumulator dials ofthe machine are motor-actuated .to add the number set up into theaccumulator. On the other hand, if the number is to lee-subtracted, thenafter the number is set up in the keys I66, the minus bar 226 is struck,which actuates the accumulator dials under the control of the keys "I66to subtract the number from the value in the accumulator.

The chief elements of the machine will now be briefly outlined withreference to Fig.. .1. Thus thekeys I66 in each oxdercontrol theaccumu-'- lator dial actuating mechanism in that order. This control iseffected by clutching the dial 264 a distance proportional to thedigital value of the" key depressed.

Selection setting mechanism ment I3I which meshes with a gear segmentl32to a common accumulator drive shaft 166 for an H interval determinedby'which particular key I66 in the associated order is depressed. Morespe cifically, this interval'is determined by clutching all the dials264 simultaneously to the shaft I66 and declutching each dial 264 fromshaft I 66 1 selectively according to the setting in the associatedorder of keys.

The machine operates in cycles, each cycle, or

' has been set by depression of one of the keys I66,

series of cycles, being initiatedby depression of either the plus key266 or the minus key 226.

During each cycle, the accumulator drive shaft I66 is rotated through a,fixed angle by means of suitable gearing, from a shaft 336, as will be'hereinafter described.

Each' accumulator dial 264 has associated therewith a mechanismincludinga declutching' ratchet. 266 adapted to be engaged bya live tip 1' 3I6 onan arresting lever 215, which lever is acturotatably mounted on a mastercam shaft I35; Attached tothe segment I32 for movement'therewith is aselection arm I36 on which a stop' arm" I31 is pivotally mounted, bymeans of a stud-I38. It will be apparent that in response to depressionof any of the keys I66, the stop arm I31 will be rotated clockwise aboutthe master cam shaft I35 2, distance proportional to the digital valueof thekey depressed.

' 7 Selection locking mechanism After the selection setting mechanismdescribed the cycle of power operation is initiated in a manner to bedescribed later, which power operation involves the rotation of themaster cam ated at the beginning of each cycle to drop the live tip 3I6out of engagement with the declutch- ,ihg ratchet 266, whichcauses thedial 264 to be clutched to the shaft 266, and rotated therewith. Thearresting lever 215 is returned to re-engage the live tip 3I6 with thedeclutchin ratchet 266 and declutch the dial 264 from the shaft I66,when the dial has been rotated the desired amount, as determined bywhich one of the associated keys I66 has been depressed. To this end thekeys I66 in each bank control an actuator mechanismincluding anordinalcam 366 and a stop arm I 31, the latter being lifted. to engagean.

ear 3I5 on the arresting lever 2 15 and carry the live tip.3I6 intoengagement with the declutching ratchet 266 at a time determined by theparticular key I66 that was depressed.

The generaloperation of the machine having been very briefly outlined,the selection mechanism-which controls'the movements of the stop arm I31will now be described in detail.

SELECTION MECHANISM The selection mechanism includes as its mainelements the keyboard, a selection setting mechanism, and a selectionlocking mechanism.

Keyboard Referring to Fig. 1, part of the keys in one order areindicated at I66 and are slidably mounted in a key frame rigidlyattached to the frame of the machine and are normally main- "tained inraised position by springs i62 unless' locked down by a lock bar I64 ofconventional construction, as described in Patent Number 2,229,630 datedJanuary28, 1941.," A selection machine.

shaft I35. To positively retain the selection arms I36 in the positionsto which they have been set, they are locked in response to initialrotation of the master cam shaft I35. Thus referring to Fig. 2, aselection lock bail MI is pivotally supported on a shaft I42, this bailhaving a horizontal flange I43 thereon, which is notched to receive aplurality of selection lock pawls I44, one for each selection arm I36 ineach order of the These look pawls I44 are also pivotally mounted on theshaft I42, and are positioned by'the notches in the flange I43 at theproper intervals to align with the dilferent selection arms. I36.- Thelock bailI4I has an arm I45 normally seated in a recess providedtherefor in a cam I46 fixed to the shaft I35, as shown in Fig. 2.However, as soon'as the shaft I35 rotates out of normal position, thecam I46 rocks the arm 'I45-downward, rotating the lockbail countertohold the arm I45 against the cam I46.

OPERATION INITIATION MECHANISM of operation is initiated by depressingeither the plus key 266 or the minus key 226 (Fig. 1A).

', This sets the accumulator shaft I66 (Fig. 6) and the master cam shaftI 35 rotating, and disengages the live tips 3I6 from the declutchingratchets 266 in various orders to start the accumulator dials rotatingin those orders.

At the f same time, the rotation of the master cam shaft I35 rotates theordinal cams 366 thereon, each associated with one of the stop arms I31.Each 'cam 366 has lobes 361 and 368, one of which,

' position shown at I31a in Fig. 1, and re-engage the live tip 3I6 withthe declutching ratchet 266 to stop the accumulator dial.

The essential difference between addition and subtraction operations isthat the master cam in Fig. 1.

cams 306 (Fig; 1) rotateone-half of a revolu-- tion in" aclockwisedirection during ea'ch cycle,

and lifting of the'stoparms I31 is eiiected by engagement of roller"'305by'thecani lobe which at the beginningof'the' cycle is'inthe lowerposition'in which lobe"'301,' for'example; isshow'n In subtraction, themasterc'am shaft I35 and ordinalcams- 306 rota'teiin couriter'clo'ckwisedirection, and liiting of the stop arms I 3I 'is effected by engagementof roller-2305 by the cam lobe which, at the beginning of thecycle; isin the upper position presently 'occupiedby lobe 308; Since eachselection'arm' I3Ii' (mounting the stop arm I31) isrotatedclockwisebythe selection mechanism a distance proportional ;to the'va'lue' of thekey I'that was depressed, theextentof rotation of the dials 264 isproportiona'l, when adding, to the value ofthedepressedikey I00, and isproportional, when subtracting; to the 9s complement thereon. In otherwords', in thep're's ent machine, subtraction isperformed by addin the9's complement of "the subtrahend into th'e accumulator dials, theaccumulator shaft being always driven in'the-same direction.

Main clutch operation by plus 'an'd'mz'nuslceys Depression of eithertheplus key 200 'or minuskey 220 actuatesthe mainclutch of the machineto start a cycle of operations-andconditions'a' reversing un'ittodetermine the directionof-irotation of the cam shaft'I35I Referring toFig. 6, the plus key 200is-secured to a key supporting member ZOImounted for-up and downmovem'entoniwo parallel li'nks202" The supportingmember I carries a roller 205 adapted. when-the key is depressed} toengage the side of a'lever 206 supported on a pivot 201 rotating'thelever clockwise and shift-*- and 203.

ing a'link I2l,' which is-pivotallv connected to lever 20$"by a pivot208.' The' oppositeen'd 0 the link I2I isconnectedby a stud 209-toa'main clutch dog II5 so that. in responsef'to depression of key 200,the clutch dog I IB is'rocked clockwise toengage' a'main clutch I I0 asdescribed in Avery Patent No. 2.062.634;

The minus key 220 which a so is c'aoable-of-"efi fecting engagement ofthe main clutch, is mount ed on a key stem 22I carryin a'rol1er 225.'wich roller overlies a diagonally extendingarm 204of lever 206 so thatdepression of the key'rocks-the lever 206 clockwise. andmainclutch dog'I I5 to clutch engaging position.

Reversing mechanism operation by plus and minus keys The manner in whichthe plus and minus keys 200 and 220*also' con'dition thereversing'mechanism to determine the direction of rotation of master camshaft l35, will now be described. The

reverse control mechanism includes a lever 235 (Fig. 6) secured: to arockable shaft IIGfwhich lever 235,When in extreme counterclockwiseposition as shown in Fig. 6,controls the drive mechanism (tobe'described later) to rotate the master cam shaft I clockwise; for'additionk-on the other hand; when lever :235 is rocked clockwise, it

conditions the drive m'echanism' to rotate 'the master cam shaft I 35-in counterc1ockwise direc tion, for subtraction.

Also secured-tothe shaft I I5 for-rocking move zgs'swsvo shaft-H515rotated in opposite directionsn Wh'e'n adding, themaster c'a'm shaft I35and ordinal ment with lever 235 is'a'lever232 havingan ear 23I inengagement with a link 22'! whichis pivot*---' ally con'riected byi astud m me b'eucrank lever 223, freelypivote'd Qn'ascreW-HI'.

As show'n in Fig. 6, the mechanism is'in; additive condition; However;if the minus=- keyv 2-20-is de-" pressed; a'stud-222 thereon engages anarm 226 'of the bellcrank lever 223rotatingthelatter in counterclockwisedirection" andishiftin'g the 115522 ito the right toniove' 'the'lever'23 time" position for counterclockwise (subtractive) movement pf themaster'cam shaft-I35? The reversing mechanism described remains inwhicheverfposition it'-' has be'en la'st' o erated Hdwe'v'erfif;ro11owmgiacmation of the-minuskey 220 the-pltis -key'20fi is'de pressed;the roller 205 connected therevifith en'- gages :the 'left e'nd of alever" 230, rockingithe latof-the master camshaft-I35? Delve MECHANISM?Main clutch- The drive m'echanism'fincludesthe main clutch" I I0,' the"reversing Iunit for coupling." the" master cam shaft 7 I 35 m the 'm'ainclut'ch, and the mechanism"for"c'oupling the a'ccu'm'u'lato'r shaft I tothefmain clutch.- I V The main clutch I I0 (Fig. 6) -.previouslyrefer'red toflis-oi-the ratchettype shown in theAveryiPatent'2;062;634"and 'is-'clriven from an electhe motor; asshown'in theprior'patent, but not disclosed herein) The motor mayoperate continuously or' 'it may be started and stopped'by'a switchactuated fromthe Ina-in clutch dog- I I 5; as disclosed in the Averypatent. V

The main clutch I I0 I may be centralizedas shown are: 3', in"whicha'centralizerlever 'I I I is freelypivot'ed on" the shaft IISj'andis-urged counterclockwise by a spring' H2 soasto press a nose I I3'into a-recess l l fi in an annulargroove' "III' (Figs. 3=andf5i in themain clutch housing;

when the clutch is disengagedah'd reaches, or"

closely approaches-, its centralized position.

The mam clutch- I I II driVeS the-"master cam shaft 7 I 35 th'rou'gli a'reversingiunit in either clockwise orcounterclockwise direction, anddrives the accumulator shaft I 'alway's'ina'clockwise di-- rection,through -a-variable speed transmi'ssion unit. i

Reversing unit The lever 2357(Fig; 6)" previously describedin connectionWith-the operation ini-tiating' mechanism, carries an arcuate arm236which is'an gled as shownin Fig; Ssothat when the-1ever235 isincountercl'ockwise"position (Fig. 6) it camsa pin 238'- (Fig. 5)*towardthe left-'ofthe' machine, whereaswhen the lever235 is m'oved'cl'ockw'isc (Fig. '6) arm236 allow'sa sprin'g'lSSKFigi-Si to retract thepin 230 towardthe right of "themachine.* A -lateral pin 240 (Fig.5)extends-from the pin 238 through anelongated hole-24 I in a bush ing242fWhich is integral With the'fliiven-holis ing of the clutch' 'I I0: Thisbushing 2 l2" fre e,ly

also have' 'slots'to receiveth'e' pinf240. Therefore the bushing 242-,driven 'by the clutch I I Dfmaybe' selectively 'coupled either to geari50 -or I 5 I, ee: pending u'pon'th'e' position of the pin238) Withtheparts adjusted i or addition; as shown in Figs;5 andEL the cIut'ch II0=drivesgear I5I in clockwise direction; gear I5I meshes with a gearI52, which in turn meshes with-a gear I 53 secured to shaft I35, so thatgear I52 is rotated in counterclockwise direction and gear I53,andmaster cam shaft I35 are rotated in clockwise direction.

On the other hand, if the minus key 220 is depressed to shift the lever235 into clockwise position, the pin 240 (Fig. 5) couples the mainclutch to the gear I50 which instead of driving gear I61, which in turnmeshes'with a gear I59 in driving relation to the accumulator shaft I60,

so that whenever the main clutch rotates through a cycle the accumulatorshaft I60 is rotated through a fixed angle in clockwise direction.

It is desirable to provide some mechanism in 'the drive between the mainclutch and the accumulator shaft I60 to reduce the shock incidenttofstarting of the dials when the accumulator clutchesenga'ge. Such ashock reducing effect is provided by the variable speed transmissionunit intercoupling the two coaxial gears I51 and I6!- (Fig. 6). Thisunit comprises a cam follower I62 (Fig. 4)

' pivotally mounted on gear I51 by pivot I63 so I that itrevolves withgear I51.

' I62 has rollers l 64 and I65 at opposite ends thereof cooperating withtwo stationary complemen- This cam follower tary cams I10 and HI. Camfollower I62 is 1 'in'thesamepla'ne as, and is mounted in, an apertureI68 (Fig. 6) in the gear I61, and the edge of the aperture defines apair of lugs I69 (Fig. 6) which embrace a tip IBI on cam follower I62.At the time duringthe counterclockwise rotation ofgear'l51and camfollower I62 when the accumulator clutches first engage, the roller I 65passes a lobe I13 (Fig. 4) 0n the cam I1I, permitting the cam followerI62 to rock-counterclockwise about its pivot I63. The correspondingmovement of the tip I6I (Fig. 6) permits a reverse movement of the gearI61 relative to the gear I51; the net effect of which is to deceleratethe gear I61 while the accumulator clutches are being engaged.

As will be explained hereinafter, accumulator clutches may also beengaged at definite, later periods in the cyc1e. Additional lobes in and.115, respectively, (Fig. 4) are provided on the cam III to deceleratethe gear I61 at those times exactly as has-been described in connectionwith the lobe I13. Following the drop off lobe I14, there is a gradualrise on the cam to the lobe I15, during which time reverse rockingmotion of the cam follower I62 occurs, accelerating the gear I61 backintononnal phase relation with the gear I51. As previouslyindicated, thecam I1 0 is complementary to the cam I1I so'that cam I10, acting uponthe roller I64, maintains the roller I65 in contact with the cam IN.

The netefiect ofthe variable speed transmission unit is to deceleratethe accumulator shaft I60 during-the periods in a cycle of operationwhen an accumulator clutch may be initially engaged and to acceleratethe accumulator shaft I during digitation when no accumulator clutch canbe engaged.

AccUMnLA'roR CLUTCHES As already briefly explained with reference toFig. 1, there is an accumulator clutch associated with each dial 264 ofthe accumulator register for clutching and declutching the associateddial into and out of driven relation with the accumulator shaft I 60.Each clutch includes a declutching ratchet 266 adapted to be engaged anddisengaged by the live tip 3I0, the dial remaining stationary when thelive tip 3I0 engages the declutching ratchet 266, as shown inFig. 1, androtating with the accumulator shaft I60 when the live tip 3I0 iswithdrawn.

The clutch mechanism will now be described in detail with reference toFigs. 11, 12, 13 and 14.

Each clutch is generically identified by the reference numeral 250 andincludes a.ratchet disc 25I keyed to the-accumulator shaft I60, adaptedto be selectively engaged by an ear 256 on a clutch dog 252 pivotallymounted by a stud 254 on a supporting member 253, which is looselymounted for rotation on the shaft I60 but is coupled to a control lever260 (Fig. 14) by engagement of twolugs 256 thereon with an ear 259 onthe ,control lever 260. The latter in turn is connected to theaccumulator dial 264 (Fig. 12) by an ear 262 on lever 260 which extendsthrough an aperture 263 in the dial. This ear 262 also extends throughan aperture in a declutching ratchet 265 (Fig. 12), so that the clutchdog 252,

dial 264 and declutching ratchet 265 are rotatable as a unit about shaftI60.

The dog 252 is constantly urged in counterclockwise direction about itspivot 254 to seat the ear 256 in one of the notches 251 of the drivingratchet disc 25I, but is normally maintained out of engagement with thedriving ratchet 25I by force exerted against a shoulder 214 (Figs. 11and 13) on dog 252 by a lug 213 on a declutching ring 210.

Referring to Figs. 11 and 11A, the supporting member-253 is mountedimmediately in front of ratchet disc 25I, and ring 210 and dog 252 aremounted in a common plane immediately in front of the supporting member253. The disc portion of the dials 264 (Fig. 12) is positioned infrontof ring 210, the declutching ratchet 265 is positioned immediately infront of the 'dials 264, and the declutching ratchet 266 is positionedin front of the declutching ratchet 265.

The ring 210 is rotatably supported on the shaft I60 by bushings TH and212, but is locked for rotation with declutching ratchet 266 by an ear261 on the latter, which projects into an aperture in ring 210 (Fig.13).

The ear 261 of necessity also projects through a recess 268 in thedeclutching ratchet 265 but this recess is elongated (Fig. 12) to permitlimited relative rotation between declutching ratchet 265 anddeclutching ratchet 266.

'When the clutch mechanism is unrestrained, as shown in Figs. 11 to 14,the force of the spring 255 maintains the dog 252 in driving engagementwith the ratchet disc 25I and also maintains the ring 210 rocked intoits most clockwise. position in which, as best shown in Figs. 11 and 12,the declutching ratchet 266 i slightly advanced clockwise with respectto the declutching ratchet 265. Under these conditions the whole clutchassembly, including the accumulator dial, is locked to the accumulatorshaft I60 for rotation therewith.

This condition can of course only prevail when the live tip 3l0 (Fig. 1)is out of engagement with the deelutching ratchet 266.

Now assume that with th clutch mechanism in the position shown in Figs.11, 12, 13 and 14, the live tip 310 (Fig. 1) is moved into engagementwith the declutching ratchet 286. De-

clutching ratchet 266 and ring 210 are blocked.

The accumulator dial 264 will remain stationary until the live tip 310is again disengaged from declutching ratchets 256 and 265, whereuponspring 255 will immediately rock the dog 252 into driven engagement withthe ratchet disc 251, the ring 210 and declutching ratchet 266 beingsimultaneously advanced with respect to the declutching ratchet 265 bypressure of the shoulder 214 on dog 252 against the lug 213 (Fig. 13).

AccUMULAroRCLUrcH CONTROL As previously indicated, the accumulator dials264 (Fig. 1) in the various orders, may be selcctively rotated byclutching them to the accumulator shaft 160 at a fixed time early in thecycle of operation and selectively declutching each dial from theaccumulator shaft 160 under the control of its associated keys 100.

Also, as previously indicated, all clutching and declutching of eachdial 264 is effected by movement of the live tip 310 on the arrestinglever L 215 associated with that clutch. These arresting levers 215 canbe rocked into clutch engaging position by rocking movement of a commonbail 290 (Fig. 1) which is rocked periodically during each cycle by acam mechanism on the main clutch shaft 330. Furthermore, a mechanismincluding a pawl 291 and a live tail 292 is provided in each order forselectively coupling the common bail 290 to the arresting lever 215 inthat order, so that under certain conditions to be described, thearresting levers do not respond to movement of the bail 290.

Accumulator clutch engaging mechanism The cam structure for engaging theaccumulator clutches includes a pair of complementary cams 280 and 281(Fig. 1) secured to the main clutch shaft .330 for rotation in clockwisedirection through one complete revolution during each cycle ofoperation. Early in each cycle a lobe 282 on cam 280 lifts a roller 283on a cam follower 285 rocking it clockwise about a. pivot 286 andalsorocking the bail 290 counterclockwise about its supporting shaft 289through a link 288 connected between one of the supporting arms of thebail 290 and an upwardly extending arm 281 on cam follower 285.

Assuming that the pawl 291 in any order is in 'normal position, as shownin Fig. l, the bail 290 engages that pawl 291 and rocks it and theassociated live tail 292 (on which it is pivotally mounted by a stud293) in counterclockwise direction about the shaft 289, on which all thelive tails are free to rotate. This counterclockwise rotation of thelive tail 292 is transferred through a compression spring 296 to itsassociated arresting lever 215, rotating the latter to disengage thelive tip 310 from the associated declutching ratchet 266 and engagingthat clutch with the shaft 150. Bail 290 immediately returns to normalposition as the lobe 282 on cam 280 passes the roller 283, but thearresting lever 215 is retained in counterclockwise position byengagement of a nose 291 on the rear end thereof with a nose 300 on alatch 298 pivotally mounted on a shaft 299 and urged clockwise by aspring 301. Frictional engagement of the nose 291 on the arresting leverby the nose 300 on the latch 298 yieldably retains the arresting leverin wln'chevcr position it has been set. The arresting lever will'hcrefore remain in clutch-engaging position until it is positivelyreturned to the normal position shown in Fig. l.

Discngagement of accumulator clutches by the selection. mechanism As hasbeen previously described, the master cam shaft 135 bearing the cams 308(Fig. 1) rotates in synchronism with the shaft 330 and prior to'thisrotation the associated selection arm 136 has been rocked clockwise adistance proportional to the value of the key that was depressed. Duringaddition, the shaft and ordinal cams 306 rotate clockwise so that thelower lobe reaches and lifts the roller 305 at a time in the cycledependent upon the value of the key 100 that was depressed. Of coursewhen the roller 395 is raised the stop arm 131 is rockedcounterclockwise about stud R39 to engage the ear 315 on the arrestinglever 215 and re-engage the live tip 310 with the declutching ratchet266 and stop the associated accumulator dial after it has rotated adistance proportional to the value of the key K00 that was depressed.

It is to relieve the shock incident to sudden stoppage of theaccumulator dial that the live tip 310 is provided on each arrestinglever 215. Thus as the nose of the live tip enters a recess in thedeclutching ratchet 266 the live tip is ini tially rockedcounterclockwise about its supporting stud 311, compressing a spring312. After a momentary yielding, the spring 312 re-expands to rock thelive tip and the declutching ratchet 266 back into normal position. Ancar 313 on the arresting lever 2'15 engages an aperture 314 in the livetip and limits the rocking movement of the latter.

If the Zero key 100 in any order is actuated, the

0 associated live tip 310 is not even disengaged from the declutchingratchet 266, because the lower lobe of cam 306 reaches roller 305 duringclockwise rotation of said cam and holds the stop arm 131 against ear315, as shown at 131a, while the bail 290 is rocked, so that rockingmovement of the live tail 292 merely compresses the spring 296 withoutmoving the arresting lever. In other words, the clutch-engagingmechanism, including the elements 291, 292, 296, 215, and 310 isdisabled.

TENS-TRANSFER Of course, in any adding machine it is necessary toprovide a mechanism for tens-transfer, i. e., adding an extra unit in anaccumulator dial when the dial in the next lower order passes from nineto zero. In the present machine, tens-transfor is accomplished in thelatter phase of each cycle of operation and is initiated by a secondlobe 345 on cam 280, which rocks the bail 299 counterclockwise in thesame manner previously described with reference to lobe 282. In theparticular machine shown, this second rocking of the bail 290 occurs atapproximately 323 of the main clutch cycle.

During tens-transfer, the arresting levers 215 are rocked to disengagethe live tips 3! 9 from the declutching ratchets 266 for a fixedinterval only long enough to rotate the dial through an increment of 1.Therefore the arresting levers 215 are automatically restored to normalposition by the bail 290 during its return movement, the bail contactingdownwardly extending arms 341 on the arresting levers and rocking themclockwise sufiiciently to carry the nose 291 on the rear end of eacharresting lever past the nose 309 on the latch 298, the spring 36!completing the restoring movement of the arresting levers by carnmingaction between the noses 300 and 291. The necessary reverse movement ofthe common bail 29!] to restore the arresting levers 215 is produced bya lobe 346 on the cam 28!, acting against roller 284 on the cam follower285.

Whether or not the arresting lever 215 in any order is moved intoclutch-engaging position (for a transfer) in response to this secondrocking of the bail 290, depends upon the position of the pawl 29! inthat order, which will be in position to be engaged by the bail 290, asshown in Fig. 1, if

the dial in the next lower order passed from nine to zero during itsdigitation phase, but will be rocked upward to clear the bail 290 if thedial in the next lower order did not pass nine during the digitationphase of the cycle. Stated in another Way, a tens-transfer is initiatedsimultaneously in each dial by the second rocking movement of bail 296unless the clutch-engaging mechanism for that dial has been disabled byclockwise rocking of its associated pawl 29!. Furthermore, theclutch-engaging mechanisms of all dials are normally disabled byclockwise rotation of their associated pawls 29! (by a disabling meansto be described), but if the dial in the next lower order has passedfrom nine to zero during the digitation phase of the cycle, thedisabling means is blocked.

Tens-transfer conditioning mechanism For convenience, the normalposition of pawl 29!, as shown in Fig. 1, will be referred to as theenabling position, since it enables the rocking movement of the bail 290to effect tens-transfer movement to the associated arresting lever 215.When tens-transfer is not desired in any order, the pawl 29! in thatorder is rocked clockwise out of the path of the bail 290 and thisclockwise position will be referred to as the disabling position.Whether or not the pawl 29! is left in enabling position, or moved todisabling position,

' is determined by whether or not the dial in the next lower order haspassed from nine to zero during the digitation phase of the cycle. Themechanism for actuating each pawl 29! will now be described withreference to Figs. 7, 8, 9 and 10.

Each pawl 29! (Fig. '7) is yieldably retained in enabling position byits associated spring 294 but can be rocked clockwise into disablingposition by engagement of an ear 39! thereon by an arm 39!! on a feelerbail 365 (Fig. 8), the movements of which are controlled by the movementof the dial in the said next lower order. As shown in Fig. 9, the arm39!! is deflected toward the next higher order, whereas the ear 39!(Fig. 7) in the next higher order, with which it cooperates, extendstoward the next lower order, or forwardly with respect to Fig. 7.

Feeler bails 365 are yieldably rocked by a special cam mechanism in themachine, but the actual amount of movement imparted to each bail. isselectively controlled and determined by its associated dial. Thus allof the feelers 365' are coupled by compression spiings 368 to a commonbail 360' which ball is rocked counterclockwise early in each cycle ofoperation by a link 351 (Fig. extending from a cam follower 353 (Fig.'1'), which is rocked about a pivot 286 by a pair of complementary cams358 and 35! fixed to the shaft-33ll. The cam follower 353 has a roller352v bearing against cam 350, and at the beginning of each cycle theroller 352 rises to an intermediate dwellv 354 on cam 350, rocking thefollower 353 clockwise and the bail 360 counterclockwise. The bail 36!]urges all the feelers 365 counterclockwise through the coupling springs368, and the initial movement of bail 360 in response to the roller 352:lding up onto the dwell 354 of the cam 350 is of such magnitude as torotate each feeler 365 into position to bring an ear 369 thereon into arecess 310 of an associated latch 31! (pivotally mounted on a shaft299), permitting the latch 31! to rock counterclockwise, under urge of aspring 313 tensioned between an ear on the latch and an ear on atens-transfer lever 38!]. Each latch 31! has an ear 315 thereon, which,when the latch 31! drops as described, comes to a rest on top of ashoulder 38! on a tenstransfer lever 380 mountedadjacent the dial 264 inthe associated order.

The foregoing operations take place earl in the main clutch cycle beforethe digitation phase.

As previously mentioned with reference to Fig. 14, each dial has securedthereto a control lever 26!] having an ear 259. This ear 259 (Fig. '7)is so oriented with respect to the dial that when the latter registers 9the ear 259 is positioned, as shown in Fig. 7, immediately above a nose382 on the tens-transfer lever 38!], and when the dial passes from 9 to0, ear 253 engages the nose 382 and rocks the lever 333 counterclockwiseon its supporting shaft 319, whereupon the shoulder 38! passes frombeneath the ear 315 on latch 31!, and the latter drops to carry the ear315 behind the shoulder 38!, locking the tens-transfer lever 380 incounterclockwise position, in which a shoulder 395 thereon lies inblocking relation in the path of movement of an car 383 on the feeler365.

As a result of the foregoing operations, at the end of the digitationphase of the cycle, the shoulder 394 will be in blocking relation withthe ear 383 in all orders in which the dial has passed from 9 to 0, butwill be out of blocking relation to the ear 383 in any order in whichthe dial has not passed from 9 to 0.

After the digitation phase is completed, the roller 352 leaves the dwell354 and rides up onto the highest part 356 of cam 35,0, thereby rockingthe bail 360 further counterclockwise an additional amount andcompressing the springs 368 to advance the'feelers 365 further incounterclockwise direction. In all orders where the dial has not passedfrom 9 to 0 and the ten-transfer lever 380 has not been elevated intothe path of the ear 383 on the feeler 365, the latter is advancedthrough a full stroke to carr the arm 39!! (on the lower end of feeler365) against the ear 39! on the pawl 29! in the next higher order andmove that pawl 29! into disabling position. On the other hand, in allorders in which the dial has moved from 9 to 0, the feelers 365 areblocked by engagement of their ears 383 with the shoulder 394 on theassociated tens-transfer levers asstgsro i 380, and the pawl 29! in thenext higher order is left in enabling position.

Obviously, the net result of the foregoing op eration is that during thetransfer phase of each cycle, the pawl 28! in each order is in normal orenabling position if the next lower dial has moved from 9 to 0 duringthe digitation phase. On the other hand, if the next lower dial has notmoved from 9 to 0 durin the digitation phase. then the pawl 255i will bein upper or disabling position during the transfer philclfz and its associated arresting lever 275 will not be actuated to add a one into theassociated dial.

Disabling tens-transfer mechanism in rightmost dial order Since therightmost dial never receives a transfer, its transfer pawl 29! (Fig. 1)must always be disabled during the transfer phase. Therefore the rightsupporting arm 359 (Fig. 10) of the bail 360 is provided with anextension 362 which functions in the rightmost order, the same as theextensions 390 (Fig. '7) on feelers 365 do in the other orders, toengage the car 39! on the rightmost pawl 29! only, to move it intodisabling position whenever the bail 360 is rocked during the transferconditioning phase. Therefore during the transfer phase the rightmostaccumulator clutch is never engaged.

Simultaneous chain transfer The mechanism so far described takes care ofthe tens-transfer necessitated by movement of a dial from 9 to 0 duringthe digitation phase of a cycle, but is incapable of cheatingtens-transfer in response to movement of a dial from 9 to 0 during thetens-transfer phase of the cycle. Obviously. however, if a dial isadvanced from 9 to 0 during the tens-transfer phase, then the adjoininghigher order dial must also be advanced, requiring what is termed chaintransfer.

In the present machine, chain transfer is effected by providing amechanism which includes a nines feeler finger 395 (Fig. 7) that isnormal- 1 rocked counterclockwise about shaft 289 with the feeler 365,by a spring 396 compressed between a lug on the extension 366 of feeler365 and an extension 391 on the nines feeler finger,

this spring normally maintaining the nines feeler finger against the ear383 on feeler 365. If the associated dial is in position other than 9,the nines feeler finger is free to move with the feeler 365 during thewhole range of movement of the latter, and performs no function.However, if the dial is in 9 position, then the nose 398 of the ninesfeeler finger 395 is intercepted by the car 259, blocking completecounterclockwise rocking 402 as described, hooks a tip 408 thereof overan car 409 formed on the right (with reference to Fig. 9) supporting armof the next lower order feeler 365. It follows that if the next lowerorder feeler 365 moves through its full stroke to disable its associatedpawl 29!, then the feeler 365 in the next higher order (the dial in ninep0sition) will likewise move through its full stroke to disable its pawl29!. On the other hand, if the feeler 365 in the lower order dial isblocked by its tens-transfer lever 380 so as not to disable itsassociated pawl 29!, then the feeler 355 associated with the nine dialin the next higher order will also be blocked and both dials will beadvanced during the transfer cycle.

Although the operation has been described specifically with reference toonly two dials, obviously if there are a series of dials in 9 positions,the chain transfer mechanism described will con...

'i-rol them all to effect simultaneous chain transfer if transfer isinitiated in the lowest order of the series.

SUMMARY OF OPERATION IN ADDITION During each cycle of operation, anumber to be added is set up in the keys 596 (Fig. 1A), after which theplus key 269 is depressed. The actuation of the keys I00 rotates eachselection arm !36 (Fig. 1) clockwise through an angle proportional tothe value of the key actuated in that order. Depression of the plus key269 shifts the link !2l (Fig. 6) to engage the main clutch lie, andactuates the lever 235 into position to drive the master cam shaft !35clockwise, if the lever 235 Was not already so actuated. At the sametime, the accumulator shaft I69 begins its clockwise rotation.

Shortly after the start of the cycle, the lobe 282 (Fig. 1) on cam 289engages the roller and rocks the common bail 296 counterclockwise,engaging it with the pawls 29l in all the orders and rocking the livetails 292 in allprders. The move ments of the live tails rock thearresting levers 215 to disengage the live tips 3H3 from the declutchingratchets 266 in all orders in which one of the keys iilil, other thanthe zero key, have been depressed, thereby clutching those dials to theaccumulator shaft M39 and starting them in clockwise rotation. In anyorder in which no key or zero key has been depressed, the live tip isnot disengaged from the declutching ratchet 266 because the stop arm israised against the cam lift on the arresting lever (by roller 305 ridingup on lobe 357 of cam 39%) and held raised while the common bail wasactuated as described.

In those orders in which a ke bearing a significant digit was depressed,the dials 284 continue to rotate, adding value thereinto proportional tothe setting of the associated selection arm !36, rotation being finallyinterrupted by raising of the stop arm it? by the lobe 39'! actingagainst roller 395.

Early in the digitation phase, the feeler 5355 (Fig. '7) of thetens-transfer mechanism in each order, was actuated b the cam 356 tobring the ear 369 on each feeler opposite the recess 9W in itsassociated latch 3?! so that if any dial rocked the associatedtens-transfer lever 369 counterclockwise by passing from 9 to 0 duringthe digitation phase, the lever was retained in rocked those orders inwhich tens-transfer is to be effected, and during the tens-transferphase the pawls 29f in those orders remain in normal position to couplethe common' bail 280 to the live tails 292 (Fig. 1) and actuate thearresting levers On the other hand, in those orders in which the dialshave not passed from 9 to 0, the tenstransfer levers 380 (Fig. 7) remainin lower position in which they do not block final movement of theassociated feelers 365, and the arms 390 on those feelers engage theears 39! on the associated pawls 29!, rockin them clockwise to clear thebail 290 and thereby prevent the actuation of the arresting levers.2!5(Fig. 1) in those orders.

If the dial in any order went from 9 to 0 during the digitation phaseand the next higher dial was left at 9, then during the tens-tranferphase the feeler finger 395 (Fig. 7) associated with the higher dial,was blocked by the ear 259 on that dial, rotating the transfer feelerhook 400 (Fig. 9) into engagement with the ear 409 on the feeler 365 inthe next lower order (the one where the dial passed from 9 to 0) so thatwhen the feeler 3'65 associated with the lower of the two dials isblocked by engagement of the ear 383 thereon with the shoulder 394 ofits associated tens-transfer lever 380 to prevent disabling of the pawl29! in the next higher order (the order containing the 9 dial), thefeeler 365 associated with the latter dial (the nines dial) in the nexthigher order, and simultaneous chain transfer occurs in the two orders.

The latches 31! (Fig. '7) are rocked upwardly following each transferphase, to release the tenstransfer levers for movement to the positionshown, so that the transfer mechanism will not be in condition to effecta transfer in those orders in which no transfer is to be entered duringsubsequent operations. When the cam assembly 350 returns to the positionshown and the cam follower 353 is rocked counter-clockwise, upon suchreturn, the bail 360 (Fig. 10) is rocked clockwise. The rear edge of thebail rocks each of the feelers 365 (Fig. 7) rearwardly and their ears369 out of the recesses 310. thereby rocking the latches 31! upwardly.The ears 315 on the latches are moved from behind the shoulders 38! ofthe tens-transfer levers which are then free to return to the positionshown under urge of the springs 313.

Of course, following counterclockwise rocking of the arresting levers215 (Fig. 1) in those orders where tens-transfer is to occur, thesearresting levers are restored by return movement of the bail 290, thebail engaging the arm 34! on the arresting levers. Extra reversemovement of the bail 290 necessary to restore the arresting levers isproduced by the lobe 346 on the cam 28! acting against the roller 284 onthe cam follower 285.

At the completion of the operations described, the main clutch !!0 (Fig.6) has made one complete revolution and is automatically disengaged bythe dog !!5, leaving the apparatus in the condition it was in at thebeginning of the cycle,

except for the new positions of the accumulator dials.

SUBTRACTION The present machine performs subtraction by adding thecomplement of the subtrahend, which consists of the nines complement ofeach digit of the subtrahend except the rightmost digit thereof, whichis the tens complement of the rightmost digit. The machine is thereforconstruoted so that when'the minus bar 220 is depressed, the machine isconditioned to add the nines complement of the digit set up in eachorder of the keyboard, and to add an additional digit in the rightmostorder.

The nines complements are obtained by rotating the ordinal cams 306(Fig. l) in reverse or counterclockwise direction so that the lobe ofeach cam which occupies the position in which lobe 308 is shown,cooperates with the roller 305 (instead of the opposite lobe, as inaddition). The lobe 308 for example moves a distance complemental tothat which the lobe 30'! would move during addition before engaging theroller 305 and rockin the stop arm !3!. For example, if the 3 key isdepressed in any order, and then the minus key 220 actuated, the ordinalcam 306 (Fig. 1) is rotated in counterclockwise direction and the lobe308 engages the roller 305 and cams the stop arm I3! upward to stop theassociated dial 264 after the dial has moved six digits in a positivedirection.

Fugitive digit Subtraction by addition of complemental numbers in themanner described requires adding an extra digit into the rightmost dialonly, which digit added under such circumstances is generally termed thefugitive digit. This addition is accomplished during each subtractivecycle before digitation starts, so that the rightmost dial is advancedone digit between the time the fugitive digit mechanism operates and thetime when normal digitation starts.

To this end, a cam 35 (Fig. 15) is secured to the driven side of themain clutch and is provided with a single lobe 3I6 so as to rock a camfollower 3!8 clockwise about its pivot stud 3!9 against the force of thespring 320, very early in the cycle. Rocking of the follower 3!8 engagesan ear 32! on the left end thereof, with a shoulder 322 on a link 323which is pivotally connected to a lever 324, by a stud 325, so that thelever 324 is rocked clockwise (about the shaft 330 on which it isloosely pivoted) and an ear 332 there on engages a nose 33! on the livetail 292 associated with the rightmost accumulator dial. Therefore, thelive tail 292 (Fig. 1) in the rightmost order is actuated to actuate itsassociated arresting lever 215 into counterclockwiseposition and engagethe accumulator clutch in therightmost dial.

The rightmost dial continues to rotate until stopped by its associatedstop arm 31, the same as are all the other dials, the only differencebeing that the rightmost dial started one digit ahead of the remainingdials.

A spring 32'! normally holds the link 323 in the position shown in Fig.15, in which the shoulder 322 is engaged by the ear 32!. The sprin alsofunctions to maintain the lever 324 in extreme counterclockwiseposition, as determined by an arm 328 cooperating with the shaft Thefugitive digit mechanism is disabled during addition. Whenever the pluskey 200 (Fig. 6) is depressed, an ear 34! thereon bears against a lever340 pivoted on the stationary screw 224, rocking the lever 340counterclockwise. This raises the outer end of the lever 340 (Fig. 15)against an ear 323a on the link 323 and elevates the latter to carry theshoulder 322 thereon clear of the path of ear 32! on the cam follower3!8.

It will be seen, therefore, that the fugitive digit mechanism isnormally maintained in operative condition, but is disabled each timethe plus key 200 is depressed to initiate an addition cycle.

DIAL CLEARANCE A clearing mechanism i illustrated particularly in Figs.16, 11 and 18, and as shown is actuated by a hand-crank 426 (Fig. 18).

Clearance is effected by disengaging the accumulator shaft I60 Fig. 6)from the main clutch H and driving it through a gear 422 which iscoupled to the crank 420 (Fig. 18). At the same time, controlmechanisms, one associated with each dial, are brought into action forclutching each dial to the shaft H until the dial is rotated into itszero position and then automatically declutching it from the shaft I60.

' Mechanism for driving accumulator shaft daring clearance In thedescription of the accumulator shaft driving mechanism, it hasheretofore been assumed that the gear I69 (Fig. '6) which normallydrives the accumulator shaft I60, is permanently (Fig. 6) on the leftend of a rocking arm 461 which is pivoted by a pair of lugs 468 (Fig.18) formed thereon and extending into slots in the abutting ends of apair of sleeve bushings 469 and 13 410, which float on a clearance driveshaft 42f, to which the crank 420 and gear 422 are secured.

The rocking arm 461 is urged into clutch-engaging position. as shown inFig. 18, by a spring 41H, compressed between the machine frame and anarm 461a welded to the rocking arm 461. The latter arm also has alateral extension 412 which extends into an aperture 413 in the gear 422(Figs. 18 and 6). The lateral extension 412 is cut diagonally at its endto form a camming surface 414 so that when the gear 422 is rotatedduring a clearance operation by the crank 426, the side of the aperture413 engages the camming surface 414 and cams the rockin arm 461counterclockwise about its lugs 468 to disengage teeth 463 and 464 f omthe teeth 46! (Fig. l8)'and thereby disconnect the accumulator; shaftl6!) from the gear train leading to the main clutch. Continued rotationof the gear 422 causes the teeth 425 thereon to engage and drive a gear424 (Fig. 18) fixed to the accumulator shaft I so that the latter isrotated during the clearance operation.

One complete revolution of the hand crank 420 and gear 422 rotates theaccumulator shaft l6!) through a sufficient angle to clear all thedials, regardless of their positions, and when the gear 422 completesits revolution the tip of the extension 412, carrying camming surface414 (Figs. 6 and 18), again snaps. into the aperture 413 in the gear,thereby retaining the latter in normal position, in which the cut-outportion 423 (Fig. 6) is juxtaposed to the gear 424, (Fig. 8), leavingthe latter free to rotate independently of gear 422. enters the aperture413, the motion of the rocking arm 461 (Fig. 18) re-engages the teeth463 with the teeth 46f, restoring the accumulator shaft in drivenrelation with the gear train extending to the main clutch.

At the same time that the tip 414 Accumulator clutch engagement daringclearance During the clearance cycle the arresting levers 215 (Fig. 1)associated with all dials are rocked to clutch their dials with theaccumulator shaft until the dials reach zero position, when thearresting levers 215 are selectively automatically actuated to declutcheach dial from the shaft and stop it in its zero position.

The mechanism for actuating the arresting levers 215 intoclutch-engaging position includes a cam 426 (Figs. 17 and 18) on theclearance drive shaft 42f. Cam 426 has a lobe 421 which, early in theclearance cycle, engages a roller 428 on a cam follower 429, rocking thelatter counterclockwise about its pivotal shaft 430 and bring ing itslower end 43f against the arm 281 (Figs. 1 and l'li to rock the camfollower 285 clockwise, a notch 432 (Fig. 1) being provided in cam 28!to allow this movement when the main clutch is in neutral position.

As previously explained, the clockwise rocking of the cam follower 285rocks the bail 29G counterclockwise (Figs. 1. l6 and 1'1) and engages athe accumulator clutches.

Accumulator clutch disengagement daring clearance As previouslyindicated, the clearance mechanism declutches each dial from theaccumulator shaft liifl as the dial moves into zero position, and themechanism for performing this operation includes the tens-transfer lever385 (Fig. '7), which, as previously described, is rockedcounterclockwise by the ear 259 on the associated dial as the latterpasses from 9 to G. This tenstransfer lever 3% has an ear 435 (Fig. 16)which, when the tens-transfer lever is rocked counter clockwise, engagesa nose 436 on a lever 431, rocking the latter clockwise about itspivotal shaft Clearance interlocks It is necessary to disable the leversduring normal operation of the machine, so that the clutches will not beautomatically disengaged as last described each time the dials pass from9 to 0. To this end, a notch 439 (Fig. 16) is provided in each lever431, which notch embraces the front flange of the bail 36!] so that whenthe ball is rocked counterclockwise during each cycle of operation, thenoses 436 on the levers 431 are rocked out of the paths of ears 435 onthe tenstransfer levers 38d, and the latter may be rocked to performtheir normal functions without causing the accumulator clutch to bedisengaged.

Means are also provided to prevent operation of the clearance mechanismwhen the accumulator shaft is being operated from the main clutch. Thusas soon as the main clutch starts. the cam 35% (Fig. 7) rocks the camfollower clockwise, and a surface 446 on the latter engages a lever 44!pivoted on shaft 430 (Fig. 16). This lever 44! has a roller 442 on itsupper end which normally seats into a recess 443 of a earn 444 (Fig. 18)secured to the clearance drive shaft 421. Lever 44f is normally free tobe rocked clockwise by the cam 444 as it rotates during clearance, butduring a main clutch cycle the surface 440 blocks movement of lever 44S,and the cam 444 and the entire clearance mechanisms is prevented frommoving out of its normal position of rest.

Having fully described the preferred embodiments of this invention, itis to be understood that I do not wish to be limited to the exactconstructions herein set forth, which may obviously be varied in detailwithout departing from the spirit of this invention, but only as setforth in the appended claims.

I claim:

1. In a register, a unidirectional accumulating member movable into aplurality of positions representative of difierent digital values, acyclically operable driving member, a clutch operable to selectivelyconnect said accumulator member to said driving member for movementtherewith, a clutch control member movable to engaging and disengagingpositions, respectively, means for moving said control member intoengaging and disengaging positions to selectively move said accumulatingmember, including clutch engaging means for initially moving saidcontrol member to engaging position, yieldable means for retaining saidmember in such position after movement thereto by said clutch engagingmeans, and clutch disengaging means operative to render said yieldableretaining means inefiective and to return said control member todisengaging position to thereby disengage said clutch after movement ofthe accumulating member through a selected number of its said positions,said clutch disengaging means including a first means selectivelysettable according to different digital values, and a second meanscooperating with and movable with respect to said first means and drivenin timed relation with said driving member, and means for reversing thedirection of movement of said second means relative to said first meansfor selectively efiecting movement of said accumulator memberproportional either to the digital value set in said first means or thenines complement thereof.

2.111 a register having a unidirectional accumulating member rotatablethrough a plurality of digital positions, a cyclically operable drivingmechanism therefor, a device selectively settable to different digitalvalues for predetermining the amount of rotation of said accumulatingmember, a clutch interposed between said driving mechanism and saidaccumulating member, and means for engaging and disengaging said clutchin any of a plurality of digital positions of said accumulating memberto selectively connect and disconnect the driving mechanisms to and fromthe accumulating member, said means comprising: a clutch control memberhaving clutchengaging and clutch-disengaging positions, means operableunder control of said driving mechanism to move said control member toclutch-engaging position in the initial portion of a cycle to therebycause the accumulating member to rotate with the driving mechanism,reversible timing means rotatably driven in timed relation to therotation of said accumulating member, reversing mechanism operable tocontrol the direction of rotation of said timing means, and meanscontrolled jointly by said device in accordance with the setting thereofand by Said timing means in accordance with the direction of rotationthereof to cause said control member to move to clutch-disengagingposition.

3. In a register having a unidirectional accumulating member rotatablethrougha plurality of digital positions, a cyclically operable drivingmechanism therefor, a device selectively settable to diiierent digitalvalues for predetermining the amount of rotation of said accumulatingmember, a clutch interposed between said driving mechanism and saidaccumulating member, and means for engaging and disengaging saidclutchin any of a plurality of digital positions of said accumulatingmember to selectively connect and disconnect the driving mechanism toand from the accumulating member, said means comprising a clutch controlmember having clutch engaging and clutch disengaging positions, meansoperable under control of said driving mechanism to move said controlmember to clutch engaging position in the initial portion of a cycle tothereby cause the accumulating member to rotate with the drivingmechanism, reversible timing means rotatable in either of two oppositedirections in timed relation to the rotation of said accumulatingmember, reversing mechanism operable to cause rotation of said timingmeans in either of said two directions, and means operable under controlof said selectively settable device and responsive to rotation of saidtiming means in one of said two directions to efiect entry into saidaccumulating member of the value set in said settable device andresponsive to rotation of said timing means in the other one of said twodirections to efiect entry into said accumulating member of the ninecomplement of the value set in said settable device.

HAROLD T. AVERY.

